KillerXtreme
join:2008-11-07
1 edit | [Connectivity] Packet Loss and Lag
Lately I've been noticing a lot of packet loss with my ISP Concast (I'm aware of how I spelt it.) When I play games online its especially noticable as I get heaps of lag every few minutes. I've talked to their customer support and no help there, they even sent out a tech to my house. He had no comment as he said everything was fine. Well everything isn't fine. So how or what do I have to do to go threw with troubleshooting this? Because this is really getting retarded as it effects me while I'm online.
For a while it started up, then had the tech come over and he replaced my modem.. Then after that it was fine, a week or so later and the problem is back. Anyone else have any issues?
Changed title to make it more descriptive of the issue. ~sorto' |
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Rxdoxx
Premium,Mod
join:2000-11-03
Middle River, MD
clubs:  | Re: Concast beeing Craptastic?
requested this be shifted to Comcast forum, better help/advice for you there
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Was a Cruise Fanatic, one cruise on Princess cured me. Bleah |
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baineschile
Premium
join:2008-05-10
Sterling Heights, MI | reply to KillerXtreme
Post some tests, and let us take a look |
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Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
clubs: | reply to KillerXtreme
Please review: »Comcast High Speed Internet FAQ »How To Get Help! |
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Cabal
Premium
join:2007-01-21
Boston, MA
| reply to KillerXtreme
»Comcast High Speed Internet FAQ »How To Get Help!
Include signal levels and traceroutes, especially when you are experiencing a problem.
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Interested in open source engine management for your Subaru? |
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pearland_guy
join:2008-08-16
Pearland, TX
1 edit | reply to KillerXtreme
yeah. Good luck trying to get someone to agree with what you are experiencing. I've had problems with my download and upload speeds for 3 months and still no line\maintenece tech has come. |
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KillerXtreme
join:2008-11-07
| reply to KillerXtreme
My statement stands, this is my Smokeping results..
»/r3/smokeping.···b45ea9d9
9% average.. With spikes up to 80% packet loss.. If not more... |
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funchords
Hello
Premium,MVM
join:2001-03-11
Washington, DC | Looks bad -- how about some signal levels (see the links mentioned above) |
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KillerXtreme
join:2008-11-07
| reply to KillerXtreme
Re: [Connectivity] Packet Loss and Lag
Downstream
Freq/Power: 705.000 MHz 4 dBmV
Signal to Noise Ratio: 39 dB
Modulation: QAM256
Upstream
Freq/Power: 29.600 MHz 37 dBmV
Channel Type: Mixed (TDMA and ATDMA)
Symbol Rate: 2560 kSym/sec
Modulation: QAM16 |
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funchords
Hello
Premium,MVM
join:2001-03-11
Washington, DC
 ·Verizon Online DSL
 ·Skype
| Those are good signals. I would not expect trouble owing to your cable connection (the black wires carrying cable signals). So we'll focus on your IP connection.
Okay, do a traceroute and notice your first outside hop that responds, then ping that 100 times and see if there is any loss.
Windows command: tracert www.google.com
linux command: traceroute www.google.com
Okay, first outside IP that answered was 71.111.112.1 so I'll use that
Windows: ping -n 100 71.111.112.1
Linux: ping -c 100 71.111.112.1
This will take under 2 minutes to complete -- the final lines will tell the loss and the delay statistics.
If these are nearly perfect, then that suggests the problem is upstream from you. We should confirm the theory and repeat this test, but this time choose some point further upstream (maybe the 5th hop instead of the first). If we can find it, then we have something more solid to tell Comcast about.
If the first-outside-hop tests were problematic, then I would start by checking everything from the ethernet connection to your broadband modem up to the computer performing the ping test. Change cables, bypass your router (connect your computer to the modem directly) or try a different modem.
Typical issues include a poorly-matching connection between the modem and the cable itself or the device on the other end of it, a failed ethernet port in the modem, a failed ethernet port in the device.
Post back and let us know.
--
Robb Topolski -= funchords.com =- Hillsboro, Oregon
More features, more fun, Join BroadbandReports.com, it's free...
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KillerXtreme
join:2008-11-07
| reply to KillerXtreme
I've ping'd the first hop several times while trying different kinds of connections for the modem. The comcast guy came out and did tests on his lil line tester, everything came out alright, we did find an issue with a line and fixed that. His line tester showed up as fine 0/1000 packets were lost. I wanted him to do another check on the line that were my modem was, but he suggested that it was fine and there was no issue.. I imediately hooked it up and ping'd and still was getting packet loss. Trying to play WoW was rediculous cause I'd always get lag/hangups.. (its not only in WoW cause vent chatter will also freeze up at the same time. ) So I had the modem connected directly to the wall with a small 1ft cable, and still had 11/2000 packets lost. Yea yea I know this isn't a lot.. However I feel it badly in games.. |
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funchords
Hello
Premium,MVM
join:2001-03-11
Washington, DC
·Verizon Online DSL
·Skype
| said by KillerXtreme  :I've ping'd the first hop several times while trying different kinds of connections for the modem. Ever see any problem during that test?
So I had the modem connected directly to the wall with a small 1ft cable, and still had 11/2000 packets lost. Hmmm. Any idea if this 11 was 11 in a row or 11 spaced out across randomly?
See if changing the packet length changes the results -- ping -l 1000 somedestinationaddress (I suggest you don't send large numbers of these pings indiscriminately as they are large packets.)
Expect loss with that test, even on great lines. What you shouldn't expect is a huge amount of loss. For example, in a 20 ping test 20 hops away, it might be okay to drop a 1000 byte packet, but it's not okay to drop half of them.
--
Robb Topolski -= funchords.com =- Hillsboro, Oregon
More features, more fun, Join BroadbandReports.com, it's free...
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KillerXtreme
join:2008-11-07
1 edit | reply to KillerXtreme
that 11 is mostly random, however a few times 2 or 3 will be jammed together... atm I don't seem to be getting much packet loss.. as I did what you suggested and pinged with 1000 bytes of data over 50 I got 0 packet loss.. I even did 10,000 for kicks, and still 0 packetloss however I only did this to the second hop.. not to a final destination, cause I was seeing most of my packetloss with the second or third hop.. (my modem being the first) Tho I did just get off the phone a lil while ago with comcast. I wasn't very happy talking to them cause they constantly treat you like you know nothing.
I especially liked the part were the guy said "Well then this isn't a comcast issue, I'd suggest you call whoever you got your computer from, and talk to their tech support." I responded with a "Well I built my computer, are you saying that this is all my fault because I'm the one the built my computer? This hasn't been an issue before, this only showed up about 2 months ago and your saying its my fault?"
He shut up after that, then I asked for a supervisor cause it was aparent he didn't know what he was talking about. All the supervisor said was it was an issue with a node, which I kinda doubt, he then said he was going to try something and reset my modem, which in turn reset my phone since I was talking threw the comcast phone # and got disconnected, which made me have to go threw the process all over again and talk to a different supervisor that ended up setting a date for another tech to come out.
I'm going to try to get in touch with a friend that lives near by and see if he's having any issues.
And yes most of my pings are to the first few hops and I see most of my packetloss there.. |
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EG
MUM
Premium
join:2006-11-18
Union, NJ
| said by KillerXtreme : I even did 10,000 for kicks, and still 0 packetloss however I only did this to the second hop.. not to a final destination, cause I was seeing most of my packetloss with the second or third hop.. (my modem being the first) W.I.W., your modem is not the first hop. Modems don't show up in traces. The first hop is either a home networking router, or if there isn't one in the path, it is the CMTS interface at the headend. |
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funchords
Hello
Premium,MVM
join:2001-03-11
Washington, DC | Exactly right, E.G. -- so if your first outside hop is always clear and your 2nd or 3rd one (and consistently beyond that one) is always lossy, then the problem is certainly within Comcast.
This one seems hard to pin down, though. |
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matt64
join:2006-10-04
Gainesville, FL | reply to KillerXtreme
Re: [Connectivity] Packet Loss and Lag
Any luck w/ this problem ? I am having the same problem w/ a new Comcast connection. Tech just came out and checked the lines, but I'm still getting 10% packet loss. Maybe it is my Motorola 5120 modem (it's a few years old)? |
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funchords
Hello
Premium,MVM
join:2001-03-11
Washington, DC
·Verizon Online DSL
·Skype
| Hi Matt,
Take the clues from this thread and do some investigating, then you should start your own Topic based on your unique set of facts.
This poster might come back and his problem might be different -- and that gets confusing when we're trying to solve two different problems in the same topic.
HTH
--
Robb Topolski -= funchords.com =- Hillsboro, Oregon
More features, more fun, Join BroadbandReports.com, it's free...
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matt64
join:2006-10-04
Gainesville, FL
| Hi Robb, You're right, I'll start my own topic.
Best
Matt
said by funchords :Hi Matt, Take the clues from this thread and do some investigating, then you should start your own Topic based on your unique set of facts. This poster might come back and his problem might be different -- and that gets confusing when we're trying to solve two different problems in the same topic. HTH |
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